@article{repeated,
  author={a},
  title={t},
  journal={j},
  year={2017},
}
@article{repeated,
  author={a},
  title={t},
  journal={j},
  year={2017},
}
@nostyle{nostyle,
  author={a},
  title={t},
  journal={j},
  year={2017},
}
